Flash file won't work when uploaded?

Hi, I’m new to flash so I apologise for my noob questions.

I have created a .swf banner and when I play it on my computer it works perfect. When I upload it, however, it doesn’t display. I put it on my webspace and went to it’s url and it was just a blank white page :stare:

I then tried another host and it didn’t display there either. I can’t figure out why this would be happening.

Any ideas?